Web-tension mechanism



May 22, 1928. 1,670,637

D. J. SCOTT WEB TENSION MECHANISM Filed July 50, 1925 6 Sheets-Sheet l33 Show/@113 May 22, 1928.. 1,670,637

D. J. sco'r'r WEB TENSION MECHANISM 6 Sheets-Sheet 2 May 22, 1928.1,670,637

D. J. SCOTT WEB TENS ION MECHANISM Filed July 30, 1925 6 Sheets-Sheet 3May 22, 1928.

D. J. scoTT WEB TENSION MECHANISM s sheets-sheet 4 Filed July 30, 1925May 22, 1928., 1,670,637

D. J. SCOTT WEB TENS I ON MECHANI SM Filed July 30, 1925 6 Sheets-Sheet5 May 22, 1928.

v D. J. SCOTT WEB TENSION MECHANISM Filed July 30, 1925 6 Sheets-Sheet 61 M :g W a 53 W 53 51 j 1 12 55 fi 10 F It as a Patented May 22, 1928UNITED STATES 1,670,637 PATENT OFFICE.

DAVID J. SCOTT, OF PLAINFIELD, NEW DAVID J'. SCOTT EXEGUTORS OF THEJERSEY, ASSIGNOR TO ISABELLA SCOTT AND ESTATE OF WALTER SCOTT, DECEASED,DOING BUSINESS AS WALTER SCOTT & COMPANY, OF PLAINFIELD, NEW JERSEY.

WEB-TENSION MECHANISM.

Application filed July 30, 1925. Serial No. 46,939.

This invention relates to web tension mechanism for rolls of paper usedin printing or other machines.

It is customary in the art, at the present time, when a feeding webbecomes slack to increase the braking action on the web roll and,conversely, when the web becomes taut to decrease the braking action onthe'web roll. Such devices are shown in the Letters Patent to Scott No.558,426 of April 14,

1896, and in the Letters Patent to Jones No.

1,395,830 of Nov. 1, 1921.

So far as my knowledge goes, this braking action has always heretoforebeen applied to 1 a roll mounted on a spindle that extends [through thecore of the roll; and, as these spindles are of considerable weight andlength, it is an awkward and burdensome \task to manipulate the spindlesand rolls.

2 One object of my invention is to provide braking means that will beassociated with chucks; that is to say, short shafts having engagingmeans at the ends that enter the hollow cores of the rolls for a shortdistance only from each end of the roll.

lVith this and other objects in view, the invention consists in thehereinafter described arrangement of parts, combination of elements andfeatures of construction, several preferred embodiments of which areshown in the accompanying drawings in which:

Fig. 1 is a vertical sectional view inthe plane of line 1-1 of Fig. 2 ofa device embodying one form of the invention:

Fig. 2 is an end view, partly in section and broken away, of the partsshown in Fig. 1, looking in the direction of arrow 2 of Fig. 1:

Fig. 3 is a side elevation of the actuator for the brake mechanism andadjacent elements:

Fig. 4 is an end elevation of the parts shown in Fig. 3 looking in thedirection of arrow 4 of Fig. 3: I

Fig. 5 is a fragmentary side elevation of one of the adjustablesupporting members:

Fig. 6 is a view, partly in section, looking in the direction of arrow 6of Fig. 5 2

Fig. 7 is a detail View of one of the adjust able-chucks and itssupporting means:

Fig. 8' is a view similar to Fig. 1, being a section taken in the planeof line 8-8, of Fig. 9, showing a modified form of the invention: i

Fig. 9 is'a view looking in the direction of.

arrow 9 of Fig. 8:

Figs. 10, 11 and 12 are views of a portion of Fig. 9 with the parts indifferent positions when different widths of webs are used.

The invention is here shown clothed in the form it could take ifembodied in a device similar to that shown in Letters Patent No.1,124,673 of January 12, 1915, where a plurality of web rolls aremounted on a rotatable carrier so that when one roll is about to becomeexhausted, another roll may be moved into position whereby the papersupply may be replenished without necessarily stopping the machine but Iwish it distinctly understood that this is but one of many forms thatthe invention might assume and that. so far as certain claims areconcerned, the invention may be applied equally as well tolaconstruction having but a single web r0 1.

l indicates a printing, or other web-pulling, machine of any suitableconstruction having a bed-plate 2. 9, 10 and 11 indicate a plurality ofweb rolls that are, in the present embodiment, successively brought intofeeding position with respect to the printing machine being here carriedby rotatable supporting means consisting of a shaft 4 mounted inpedestals 3 and two spiders or supporting members 5 and 6, each of whichspiders has three arms there being provision at the end of each arm forholding a chuck 8; that is to say, the two supporting members carry aplurality of sets of opposed chucks, one chuck of each set being on one,and the other on the other, of the supporting members, said chucks beingadapted to project into and engage the hollow core 7 of a web roll.Supporting members 5 and 6 are adjustable lengthwise of shaft 4 towardand away from each other but on account of a key connection arerotatable with the shaft in any adjustable position. The roll 9 is shownin feeding position and the web 14, being the feeding web passing to theprinting ;.machine, is shown threaded through the parts. Shaft 4 carriesa worm wheelf41 driven by worm 42 that may be tu'rnedby hand, or amotor, to bring succcssiveweb rolls into feeding position; and it willbe understood that'if paste be applied to substitute or replenishingroll 10 and then, while the press is being run at slow j speed, thesupporting means be rotated clockwise (in Fig. 1), roll 10 (beingrotated slowly by hand) will come in contact with web 14 and 10 and 14may then be pasted together. As soon as the two webs are joined, the webfrom roll 9 may be broken and roll 10 be moved into the position previously occupied by roll 9 and the exhausted core from roll 9"may betaken outand a fresh roll put in while in the position occupied by roll11.

Suitable controlling mechanism, governed by the tension of the feedingweb, and suita l e brake mechanism for the web rolls are provided.Preferably, the construction is such that the brake mechanism relatingsolely to the roll in feeding position is affected by the controllingmeans, and also, preferably, the parts are soarranged that the movementof a new roll intofeeding pos1- tion will not merely bring' the partsinto such relation that the controlling mechanism and the brakemechanism may coact when coupled up, but the parts become automaticallycoupled or related so; that no additional work, such as latching twoparts together, is necessary. Preferably, the controlling mechanism,mounted independently of the supporting means for the web rolls,consists of a controlling member and associated elements, and anactuating member centrally disposed with respect to the web rolls.

The brake mechanism as here constructed is as follows: One or both ofthe chucks of each set carries a brake wheel 12 V-shape against whichare clampe the friction straps 13, with the, usual adjustment forcompressing the straps around the brake pulley to produce more or lessbraking effeet. The tension straps 13, in addition to the usual handscrew adjustment, are mounted insuch manner that the ends of the strapsopposite the hand wheel adjustment are also movable to increase ordecrease the wrap of the brake shoes! by means of toggle 37 with theusual toggle connections. This to gle 37 has a brake rod 38 slidingthrough a liracket 39 and ending in anadjusting screw 40 which is inposition to be acted on by cam 36 on sliding collar '35.

The controlling mechanism is here constructed as follows:

(Jam 36 and sliding collar 35 constitute an actuating member centralwith respect to the web rolls. The slidin collar is carried loosely onshaft 4, is ad ustable lengthwise thereof, and is prevented fromrotating by means of pin 43 extendin into pedestal 3. Cam 36 is so shaed as to be active with respect to the bra e rod of the web roll infeeding position.

Side register of the web can be obtained in the usual manner, eitherbyshifting one of the pedestals 3 sidewise and with it the preferably I1y disposed shaft 4 and all that it carries, or shaft 4 may be mountedto slide back and forth to side register the webs; or, if preferred,each web can be side registered individually by moving the paper-rollspindle sidewise, such as is usually done on floor fed newspaper pressesand in common practice in the art. Web-14 runs to spring roller 15 whichis of the ordinary construction and provides some yield to thevariations in the Windin of the Various rolls of paper. From this roler, the web passes underneath the automatic tension-adjusting roll 16and from there on to press roller 17 and thence into the press.Tension-adjusting roller 16 is carried by arms 18 on shaft 19 which ispivoted in the frame or bracket 20. On shaft 19 there is an extensionrod 22 and balance weight 2? which balance weight ing closer to andfarther from the shaft 19 and this counter-balances the weight of theroller 16 and arms 18. Carried also by shaft 19 is the lever 24connecting with dash pot 25 which may be an air or oil checking deviceto steadythe travel of the web-tension roller 16 and to prevent violentand continuous vibration of the roller. There is also carried on shaft19, adjusting lever 26 carrying a roll 27 that operates a crank lever28. This crank lever is pivoted to frame 20 at point 29. The spring 30is arranged to pull up one end ofcrank lever 28, while to the other endthere is pivoted connecting rod 31 having a piston 43 sliding incylinder 44 containing oil or other fluid; and from this cylinderextends a duct 45 that connects with a cylinder 46 in which latter isseated apiston 47 subjected to the pressure of a spring 48 on one sideand to the pressure of fluid from duct 45 on its other side. .Piston 47has arod 49 suitably connected to hell crank 32 which is forked at itslower end and terminates'in shoes 33 operating in groove 34 of slidingcollar 35. It will be understood that in case it is desired to applybraking action on both ends of the roll, there may be another duct 45leading to the other side of the machine and to a similar arran ementand fluid actuated means and slida le collar. Inasmuch as all the chucksare constructed alike, a description of one will suflice. Chuck 8 iscarried by a short shaft 50 that extends through an opening 50" in anarm of a supporting member. This supporting member is also provided witha bracket 51 into which the short shaft 50 extends. Mounted in thisbracket is a threaded member'52 that engages corrc- ..the brakemechanism will be retained. It

will be understood that if the chuck'is provided with a brakingmechanism as described and suitable connections such as the slidablecollar and cam 36 are provided at each side of the machine, the brakingaction may be applied to both ends of the web roll in response tovariations in the tension of the web from the feeding roll. Instead ofusing a fluid pressure system, the form of the invention shown in Figs.8 and 9 may be employed. As here indicated, arm 28 is attached to atransversely extend ng rod 55 from which extends at opposite endsthereof connections 56 attached to bell crank 57 which latter, in turn,is connected with bell crank 32 by means of arm 58.

In Figs. 10, 11 and 12 are shown different ways of adjusting the devicewhen it is desired to use a web roll of less width than standard. Forinstance, in printing machines 1t is customary to use a four-pagewideweb but it sometimes happens that it is desired to use only a two-pageWide web, or a three-page wide web, or a web of other smaller dimension.When it is desired to use a web of such smaller dimension, operatingconditions may require that this web be run at one side of a machine, orat the other side, or in the middle, or at some other point.

In case it is desired to use a two-page wide web centrally of themachine, then the arrangement might be as shown in Fig. 10 Wheresupporting members 5 and 6 are .shown as having been adjusted towardeach other to enable the chucks to be brought properly into engagementwith the web rolls; and, in order to transmit the motion from theconnections controlled by the tension of the web, member 35 may beretained nected with member 35 or with the bell in its position andanother member 59 with a cam 60 similar to cam 36 may beconcrankoperating that member by suitable means, such as rod 61, so that member59. and cam 60 will receive exactly the same motion as that imparted tomember 35.. In case it is desired to use a two-page wide web at one sideof the machinefthen the arrangement in Fig. 11 may be resorted to. Inthis case, member 35 and cam 36 atone side of the machine are retainedin their original position, as shown in Figs. 2 and 9; but, on. theother-side of the machine an auxiliary member 59 and auxiliary cam 60may be employed and a long connecting member 62 is used to transmitthemotion. In case a three-page wide web is used at one side of themachine. then the arrangement shown in Fig. may be employed and thisarrangement is substantially the same as that shown in Fig. 11 exceptthat a shorter connecting member 63 is used at one side of the machine."

While the particular means for transmitting motion from the web tensionroller to.

It is important that braking pressure he applied substantially equallyat opposite ends of the roll. In the form of the invention shown inFigs. 1 and 2 it will be seen that the fluid pressure sends equalimpulses in both directions through ducts 45 and 45 while in Figs. 8 and9 equalizing bar 55 serves to transmit an equal movement to both of theconnections 56.

I claim:

1. Tension device for web rolls including: means for bringing web rollshaving hollow cores, one at a time into feeding position, a plurality ofsets of chucks carried by said means to enter the hollow cores of theweb rolls, controlling mechanism governed by the tension of the web fromthe roll in feeding position, and a plurality of brake mechanisms onefor a chuck of each roll movable with said means to co-act with saidcontrolling mechanism as each roll comes into feeding position.

2. Tension device for Web rolls including: means for bringing web rolls,having hollow cores, one at a time into feeding position, a plurality ofsets' of chucks carried by said means to enter the hollow cores of theweb rolls, controlling mechanism governed by the tension of the web fromthe roll in feeding position, and a plurality'of brake mechanisms onefor the chucks of each roll movable with said means to co-act with saidcontrolling mechanism as each roll comes into feedin position. i

3. ension device for web rolls including:

means for bringing web rolls, having hollow Union and State of NewJersey, this 24th day of July, 1925.

. DAVID Jjsoo'rr.

